Rename OWNERS assignees: to approvers:

They are effectively the same, assignees is deprecated

docs/getting-started-guides/alternatives.md

@@ -1,5 +1,5 @@
 ---
-assignees:
+approvers:
 - pwittrock
 title: Deprecated Alternatives
 ---
@@ -7,4 +7,4 @@ title: Deprecated Alternatives
 # *Stop.  These guides are superseded by [Minikube](../minikube/).  They are only listed here for completeness.*
 
 * [Using Vagrant](https://git.k8s.io/community/contributors/devel/local-cluster/vagrant.md)
-* *Advanced:* [Directly using Kubernetes raw binaries (Linux Only)](https://git.k8s.io/community/contributors/devel/local-cluster/local.md)
+* *Advanced:* [Directly using Kubernetes raw binaries (Linux Only)](https://git.k8s.io/community/contributors/devel/local-cluster/local.md)